// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
//
// You are hereby granted a non-exclusive, worldwide, royalty-free license to use,
// copy, modify, and distribute this software in source code or binary form for use
// in connection with the web services and APIs provided by Facebook.
//
// As with any software that integrates with the Facebook platform, your use of
// this software is subject to the Facebook Developer Principles and Policies
// [http://developers.facebook.com/policy/]. This copyright notice shall be
// included in all copies or substantial portions of the software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#import "FBSDKMessengerApplicationStateManager.h"

#import <UIKit/UIKit.h>

#import "FBSDKMessengerContext.h"


@implementation FBSDKMessengerApplicationStateManager

- (instancetype)_init
{
  if ((self = [super init]) != nil) {
    NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
    [defaultCenter addObserver:self selector:@selector(applicationWillResignActive:) name:UIApplicationWillResignActiveNotification object:nil];
  }
  return self;
}

+ (instancetype)sharedInstance
{
  static FBSDKMessengerApplicationStateManager *_sharedInstance;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    _sharedInstance = [[self alloc] _init];
  });
  return _sharedInstance;
}


- (void)applicationWillResignActive:(NSNotification *)notification
{
  self.currentContext = nil;
}

@end
